Telephone toll-circuits



J. F. TOOMEY.

TELEPHONE TOLL CIRCUITS.

APPLICATION FILED FEB.20, 1919.

1,348,909. Pat nted Aug- 10, 1920.

i mmhphgfi IN V EN TOR.

I Z W j A'TTORNEY UNITED STATES PATENT OFFICE,

'- JOHN TOOMEY, OF NEW YORK, N. ASSIGNOR TO AMERICAN TELEPHONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK. I

TELEPHONE TOLL-CIRCUITS.

To all whom it may concern: I 1 Beit known that I, JOHN F. .TOOMEY, re siding at New York, in the county of New York andState of N ewYork, have invented certain Improvements in Telephone Toll- Circuits, of whichthe following is a specification. 4

This inventionrelates to telephone apparatus and circuits for use in connection with telephone toll systems. w

In telephone toll systems it is sometimes difiioult to complete a connection because,

for example, of a'change .innumber of a called subscriber. When a number has been changed a speclal marklng. 1s placed on the jack at a swltching'posltlon. In suchinstances, it is customaryfor the toll switch ing operator to connect with a so-called multiple marking operator, in order that the toll operator may obtain the desired informa tion. ,Theinultiple marking op'erator also handles trunks from local switchboard positions, and completes calls from these trunks through her own position. Y The completion ofcalls for toll service by the-multiple mark ing. operator is not desirable, however, because of transmission losses incurred by the additional circuits and apparatus involved. It is desirable, therefore, that themultiple marking operator be provided with' special cord circuits for answering toll calls of the type above referred to',and with other cord circuits for completing local connections. One of the principal features of this ,inven tion is the provision of means whereby cords of the former type may be usedfforanswering toll calls only, and cannot be used for completing toll connections; while cords of the latter type cannotbeused for communication over the toll trunks. Further phases of the invention'will'hereinafter appear.

- This invention is realized by providing means in connection with, the toll trunks whereby the transmission circuit of" the trunk is only rendered operative when on'e of the special cord circuits above" referred to is associated therewith. The transmis sion circuitremains'inoperative, when one'of the cords employed for h'andling local trunks is associated therewith.-

The invention W111 be described in damn I Specification of Letters Patent. Patented A i 10, 192() AliplicationfiledFbruaryQO,1919. Serial No. 275,174.

" I in connection with theafccompanying drawing illustrating diagrammatically a system 1n which it is embodied.

At Aa trunk circuit is shown leading from the toll operators position to a multiplemarking operators position, and at B and C are illustrated cord circuitsfor use in connection withthe marking operators posit'lon, the'cord circuit B being adapted for answering toll calls, and the cord circuit C being adapted for completing local connections. The details of this circuit may be sufiiciently understood from a description of theope'ration, which is as follows It will be assumed that a toll operator desires to be connected with a marking'operator, In such case, the plug of a toll switching trunk (not shown) 1s inserted in the jack J, and upon application of ringing current from the tollswitching trunk, relay 5 is energized in a well known manner, and is locked up over a circuit as follows: grounded battery, through upper winding of relay 5, including its contact and armature, conductor 8, contact and armature of relay 7 to. ground. 7 Upon the energization of relay 5, its armature is attracted and a current path is established for lighting lamp 6, from ground, armature and back contact of sluggish relay 7, conductor 8,"armature and contact of relay 5, conductor 9, through said lamp to grounded battery. The multiple marking operator is thus signaled, and upon inserting plug P in jack J relay 7 is energized by the following circuit: ground, middle back contact of relay 15, conductor 10, winding of relay 7, conductors l1 and 12, tip contacts of jack J and plug P, through repeating coil R, ring contacts of plug P and jack J talking conductor 13, inner lower back contact of relay 15, resistance 14 to grounded battery, The energization of relay ;7 causes it to attract its armature, and the circuit'previously mentioned in connection with the lighting of lamp 6, as well as the locking circuit of relay 5, is broken. The energization of relay 7 therefore causes the'relay 5 to release its armature. Relay is now operated and locked by a circuit which may be traced from ground, armature and front contact of relay 7, conductor 16,

winding of relay 15, conductor 17, sleeve contactsof jack J and plug 1? to grounded battery. The relay lt in operating attracts the marking operator to the toll switching operator. The circuit remains-in this' co'n dition until the multiple marking operator removes plug P from the jack J whereupon: 1 thecircuits and apparatus resumetheirnorp V isprevented'from becoming operative when Should the multiple marking operator atmal arrangement.

tempt to' employ the cord C, which is in tended only for use with local interconnections, to answera call on trunkcircuit A, the relay 7 will not operate. The insertion of the plug P fofcord C in the jack will not provide for current flow because a? short circuiting path may betraced from ground, conductor 10,7windir'1g ofrelay conductors ll'andll2, tip contacts of jackJ and plug P upper left hand winding of repeating coil'R to ground. lt will therefore be seen that no operative circuit is established; "As described in connection with-plug P of cord B and trunk circuitfA, the operation of relay 15 furnishes a talking circuit for themarking operator, but ifthe-cord C were employed by said operator no talking cir cuit would beestablished because of the nonoperation of relays'l and 1 5. The'la'mp fi would not be extinguished'by the. employ; ment of the cord C, and the operator noting these irregularities would readilybe ap prised of her mistake, and would at once substitute the correct or B cord.

By the arrangement just disclosed,it will be apparent that. a toll operator is enabled to obtain any de ired information from a multiple marking operator, and "is in a position to complete a toll call without increased loss in transmission, andthat said multiple marking operator-is provided with cords and. trunks for connection with the toll operator, but such" cords and trunks are not capable of completing -toll calls.

Further, that the multiple markingoperator is provided withother cords which are cao pable of interconnecting local calls, but "are inoperative in connectionwith toll trunks.

It will be obvious that the-general principles herein disclosed may b'eembodied "in many other organizations widelydiflerent from those. illustrated without departing from'the spirit of theinventi'on, as defined in the following claims. H a Having thus described my invention,lwhat I desire to secure vby Letters Patent 'is 7 ,1. In a telephone system, a toll' truhk, talking conductors for said trunk,f accord circuit for answering calls incoming: over saidltrunk, a second cord circuit for completing local connections, and means including a relay bridged across the talking conductors of said trunk wherebya talking connection'maybe established with said first mentioned cord circuit only.

2; Ina telephone system,i a*tol l trunk-,

talkingconductorsfor-said trunk, a cord circuit operable with said trunk, a second 1 cord circuit associated therewith and operable with other trunks, and'means including a-relay bridged across the talkingconductors of saidtrunk whereby the talking circuit a relay bridged across the talking conductors of said trunk-whereby the talking conpleting local connections, means including nection is completed when said first men- I tioned cordcircuit is' c'onnected with-the said trunk-and whereby the talking circuit is -held inoperative when" the second mentioned] cord circuit is connected with said "4:."In a telephoneisystem, a toll trunk,

talking conductors for said trunk, a cord circuit, a second cord circuit associated therewith, meansjmcludlng a relay br dged acrossthe talking conductors of said trunk V for completing a talking circuit only when the first mentioned cord'circuitis connected with said u trunk, {said second f cord circuit being inoperative whenso associated. p

.5. In; a telephone} system, atoll trunk, talking conductors i for said" trunk, a cord circuit for answeringycalls incoming over said trunk, a secondcord circuit-for completing local, connections, means including afslo'wf acting relay'bridged across the talk ingiconductors of said trunk whereby the talking-connection may be completed when said first r'nentionedcord circuit is connected with s'aid trunk andwhereby the talking circuit ifs renderedunoperative when the second mentioned cord circuit is connected with 'said runk. V I 7 V 6, In a; telephone" system,*a toll trunk, tallcingjconductorsffor said trunk, a cord circuit, a1 second gcord circuit associated therewith, a sleeverelay for controlling the completion of the circuit over said talking conductors, means including arelay bridged across the talking conductors of saidtrunk for controlling the sleeve relay, said relay being only"operable when said" first mentioned cord circuit is associated with said trunk and being inoperative when said secioindicor'd r ui isif ojas ocia ed;

' "7'. In a" tele hone system, aftoll trunk,

talking n up or thereieeleg relaylbr g across said conductors, a signal controlled thereby, a cord circuit, a second cord circuit associated therewith, means including a relay bridged across the talking conductors in said trunk in series With a battery operative only upon the association of the first cord circuit with said trunk for completing a talkingconnection, said last mentioned relay also comprlsing means for deenergizlng sald name to this specification this 19th day of February, 1919.

JOHN F. TOOMEY. 

